openstack/neutron
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[doc][IPv6] make kernel config addr_gen_mode clear

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1. There is no such config ``net.ipv6.conf.*.addr_gen_mode``
   for some kernel version, for instance:
   3.10.0-862.14.4.el7.x86_64
2. According to the commit [1], this config is used for
   link-local and autoconf addresses.

[1] d35a00b8e3

Change-Id: Ib8e0dda5ecc668ad936155df101dc696141f8d60
This commit is contained in:
LIU Yulong 2019-10-02 14:30:04 +08:00 committed by Brian Haley
parent 2ffaa40b43
commit 3fe4df00e3
1 changed files with 14 additions and 2 deletions
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16
doc/source/admin/config-ipv6.rst
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@ -432,9 +432,21 @@ they might not be able to communicate properly on the network. For example,
in Linux guests, these are controlled via these two ``sysctl`` variables: in Linux guests, these are controlled via these two ``sysctl`` variables:
- ``net.ipv6.conf.*.use_tempaddr`` (Privacy Extensions) - ``net.ipv6.conf.*.use_tempaddr`` (Privacy Extensions)
- ``net.ipv6.conf.*.addr_gen_mode`` (link-local and autoconf address generation)
Both of these settings should be disabled (zero). This allows the use of non-changing interface identifiers for IPv6 addresses
according to RFC3041 semantics. It should be disabled (zero) so that stateless
addresses are constructed using a stable, EUI64-based value.
- ``net.ipv6.conf.*.addr_gen_mode``
This defines how link-local and auto-configured IPv6 addresses are
generated. It should be set to zero (default) so that IPv6
addresses are generated using an EUI64-based value.
.. note::
Support for ``addr_gen_mode`` was added in kernel version 4.11.
Other types of guests might have similar configuration options, please Other types of guests might have similar configuration options, please
consult your distribution documentation for more information. consult your distribution documentation for more information.